file.c

   1 /*
   2  * libuci - Library for the Unified Configuration Interface
   3  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU Lesser General Public License for more details.
  13  */
  14
  15 /*
  16  * This file contains the code for parsing uci config files
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <sys/file.h>
  23 #include <stdbool.h>
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <stdio.h>
  27 #include <ctype.h>
  28 #include <glob.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31
  32 #include "uci.h"
  33 #include "uci_internal.h"
  34
  35 #define LINEBUF 32
  36
  37 /*
  38  * Fetch a new line from the input stream and resize buffer if necessary
  39  */
  40 __private void uci_getln(struct uci_context *ctx, int offset)
  41 {
  42         struct uci_parse_context *pctx = ctx->pctx;
  43         char *p;
  44         int ofs;
  45
  46         if (pctx->buf == NULL) {
  47                 pctx->buf = uci_malloc(ctx, LINEBUF);
  48                 pctx->bufsz = LINEBUF;
  49         }
  50         /* It takes 2 slots for fgets to read 1 char. */
  51         if (offset >= pctx->bufsz - 1) {
  52                 pctx->bufsz *= 2;
  53                 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
  54         }
  55
  56         ofs = offset;
  57         do {
  58                 p = &pctx->buf[ofs];
  59                 p[0] = 0;
  60
  61                 p = fgets(p, pctx->bufsz - ofs, pctx->file);
  62                 if (!p || !*p)
  63                         return;
  64
  65                 ofs += strlen(p);
  66                 if (pctx->buf[ofs - 1] == '\n') {
  67                         pctx->line++;
  68                         return;
  69                 }
  70
  71                 pctx->bufsz *= 2;
  72                 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
  73                 if (!pctx->buf)
  74                         UCI_THROW(ctx, UCI_ERR_MEM);
  75         } while (1);
  76 }
  77
  78 /*
  79  * parse a character escaped by '\'
  80  * returns true if the escaped character is to be parsed
  81  * returns false if the escaped character is to be ignored
  82  */
  83 static bool parse_backslash(struct uci_context *ctx)
  84 {
  85         struct uci_parse_context *pctx = ctx->pctx;
  86
  87         /* skip backslash */
  88         pctx->pos += 1;
  89
  90         /* undecoded backslash at the end of line, fetch the next line */
  91         if (!pctx_cur_char(pctx) ||
  92             pctx_cur_char(pctx) == '\n' ||
  93             (pctx_cur_char(pctx) == '\r' &&
  94              pctx_char(pctx, pctx_pos(pctx) + 1) == '\n' &&
  95              !pctx_char(pctx, pctx_pos(pctx) + 2))) {
  96                 uci_getln(ctx, pctx->pos);
  97                 return false;
  98         }
  99
 100         /* FIXME: decode escaped char, necessary? */
 101         return true;
 102 }
 103
 104 /*
 105  * move the string pointer forward until a non-whitespace character or
 106  * EOL is reached
 107  */
 108 static void skip_whitespace(struct uci_context *ctx)
 109 {
 110         struct uci_parse_context *pctx = ctx->pctx;
 111
 112         while (pctx_cur_char(pctx) && isspace(pctx_cur_char(pctx)))
 113                 pctx->pos += 1;
 114 }
 115
 116 static inline void addc(struct uci_context *ctx, int *pos_dest, int *pos_src)
 117 {
 118         struct uci_parse_context *pctx = ctx->pctx;
 119
 120         pctx_char(pctx, *pos_dest) = pctx_char(pctx, *pos_src);
 121         *pos_dest += 1;
 122         *pos_src += 1;
 123 }
 124
 125 /*
 126  * parse a double quoted string argument from the command line
 127  */
 128 static void parse_double_quote(struct uci_context *ctx, int *target)
 129 {
 130         struct uci_parse_context *pctx = ctx->pctx;
 131         char c;
 132
 133         /* skip quote character */
 134         pctx->pos += 1;
 135
 136         while (1) {
 137                 c = pctx_cur_char(pctx);
 138                 switch(c) {
 139                 case '"':
 140                         pctx->pos += 1;
 141                         return;
 142                 case 0:
 143                         /* Multi-line str value */
 144                         uci_getln(ctx, pctx->pos);
 145                         if (!pctx_cur_char(pctx)) {
 146                                 uci_parse_error(ctx, "EOF with unterminated \"");
 147                         }
 148                         break;
 149                 case '\\':
 150                         if (!parse_backslash(ctx))
 151                                 continue;
 152                         /* fall through */
 153                 default:
 154                         addc(ctx, target, &pctx->pos);
 155                         break;
 156                 }
 157         }
 158 }
 159
 160 /*
 161  * parse a single quoted string argument from the command line
 162  */
 163 static void parse_single_quote(struct uci_context *ctx, int *target)
 164 {
 165         struct uci_parse_context *pctx = ctx->pctx;
 166         char c;
 167         /* skip quote character */
 168         pctx->pos += 1;
 169
 170         while (1) {
 171                 c = pctx_cur_char(pctx);
 172                 switch(c) {
 173                 case '\'':
 174                         pctx->pos += 1;
 175                         return;
 176                 case 0:
 177                         /* Multi-line str value */
 178                         uci_getln(ctx, pctx->pos);
 179                         if (!pctx_cur_char(pctx))
 180                                 uci_parse_error(ctx, "EOF with unterminated '");
 181
 182                         break;
 183                 default:
 184                         addc(ctx, target, &pctx->pos);
 185                 }
 186         }
 187 }
 188
 189 /*
 190  * parse a string from the command line and detect the quoting style
 191  */
 192 static void parse_str(struct uci_context *ctx, int *target)
 193 {
 194         struct uci_parse_context *pctx = ctx->pctx;
 195         bool next = true;
 196         do {
 197                 switch(pctx_cur_char(pctx)) {
 198                 case '\'':
 199                         parse_single_quote(ctx, target);
 200                         break;
 201                 case '"':
 202                         parse_double_quote(ctx, target);
 203                         break;
 204                 case '#':
 205                         pctx_cur_char(pctx) = 0;
 206                         /* fall through */
 207                 case 0:
 208                         goto done;
 209                 case ';':
 210                         next = false;
 211                         goto done;
 212                 case '\\':
 213                         if (!parse_backslash(ctx))
 214                                 continue;
 215                         /* fall through */
 216                 default:
 217                         addc(ctx, target, &pctx->pos);
 218                         break;
 219                 }
 220         } while (pctx_cur_char(pctx) && !isspace(pctx_cur_char(pctx)));
 221 done:
 222
 223         /*
 224          * if the string was unquoted and we've stopped at a whitespace
 225          * character, skip to the next one, because the whitespace will
 226          * be overwritten by a null byte here
 227          */
 228         if (pctx_cur_char(pctx) && next)
 229                 pctx->pos += 1;
 230
 231         /* terminate the parsed string */
 232         pctx_char(pctx, *target) = 0;
 233 }
 234
 235 /*
 236  * extract the next argument from the command line
 237  */
 238 static int next_arg(struct uci_context *ctx, bool required, bool name, bool package)
 239 {
 240         struct uci_parse_context *pctx = ctx->pctx;
 241         int val, ptr;
 242
 243         skip_whitespace(ctx);
 244         val = ptr = pctx_pos(pctx);
 245         if (pctx_cur_char(pctx) == ';') {
 246                 pctx_cur_char(pctx) = 0;
 247                 pctx->pos += 1;
 248         } else {
 249                 parse_str(ctx, &ptr);
 250         }
 251         if (!pctx_char(pctx, val)) {
 252                 if (required)
 253                         uci_parse_error(ctx, "insufficient arguments");
 254                 goto done;
 255         }
 256
 257         if (name && !uci_validate_str(pctx_str(pctx, val), name, package))
 258                 uci_parse_error(ctx, "invalid character in name field");
 259
 260 done:
 261         return val;
 262 }
 263
 264 int uci_parse_argument(struct uci_context *ctx, FILE *stream, char **str, char **result)
 265 {
 266         int ofs_result;
 267
 268         UCI_HANDLE_ERR(ctx);
 269         UCI_ASSERT(ctx, str != NULL);
 270         UCI_ASSERT(ctx, result != NULL);
 271
 272         if (ctx->pctx && (ctx->pctx->file != stream))
 273                 uci_cleanup(ctx);
 274
 275         if (!ctx->pctx)
 276                 uci_alloc_parse_context(ctx);
 277
 278         ctx->pctx->file = stream;
 279         if (!*str) {
 280                 ctx->pctx->pos = 0;
 281                 uci_getln(ctx, 0);
 282         }
 283
 284         ofs_result = next_arg(ctx, false, false, false);
 285         *result = pctx_str(ctx->pctx, ofs_result);
 286         *str = pctx_cur_str(ctx->pctx);
 287
 288         return 0;
 289 }
 290
 291 static int
 292 uci_fill_ptr(struct uci_context *ctx, struct uci_ptr *ptr, struct uci_element *e)
 293 {
 294         UCI_ASSERT(ctx, ptr != NULL);
 295         UCI_ASSERT(ctx, e != NULL);
 296
 297         memset(ptr, 0, sizeof(struct uci_ptr));
 298         switch(e->type) {
 299         case UCI_TYPE_OPTION:
 300                 ptr->o = uci_to_option(e);
 301                 goto fill_option;
 302         case UCI_TYPE_SECTION:
 303                 ptr->s = uci_to_section(e);
 304                 goto fill_section;
 305         case UCI_TYPE_PACKAGE:
 306                 ptr->p = uci_to_package(e);
 307                 goto fill_package;
 308         default:
 309                 UCI_THROW(ctx, UCI_ERR_INVAL);
 310         }
 311
 312 fill_option:
 313         ptr->option = ptr->o->e.name;
 314         ptr->s = ptr->o->section;
 315 fill_section:
 316         ptr->section = ptr->s->e.name;
 317         ptr->p = ptr->s->package;
 318 fill_package:
 319         ptr->package = ptr->p->e.name;
 320
 321         ptr->flags |= UCI_LOOKUP_DONE;
 322
 323         return 0;
 324 }
 325
 326
 327
 328 /*
 329  * verify that the end of the line or command is reached.
 330  * throw an error if extra arguments are given on the command line
 331  */
 332 static void assert_eol(struct uci_context *ctx)
 333 {
 334         char *tmp;
 335         int ofs_tmp;
 336
 337         skip_whitespace(ctx);
 338         ofs_tmp = next_arg(ctx, false, false, false);
 339         tmp = pctx_str(ctx->pctx, ofs_tmp);
 340         if (*tmp && (ctx->flags & UCI_FLAG_STRICT))
 341                 uci_parse_error(ctx, "too many arguments");
 342 }
 343
 344 /*
 345  * switch to a different config, either triggered by uci_load, or by a
 346  * 'package <...>' statement in the import file
 347  */
 348 static void uci_switch_config(struct uci_context *ctx)
 349 {
 350         struct uci_parse_context *pctx;
 351         struct uci_element *e;
 352         const char *name;
 353
 354         pctx = ctx->pctx;
 355         name = pctx->name;
 356
 357         /* add the last config to main config file list */
 358         if (pctx->package) {
 359                 pctx->package->backend = ctx->backend;
 360                 uci_list_add(&ctx->root, &pctx->package->e.list);
 361
 362                 pctx->package = NULL;
 363                 pctx->section = NULL;
 364         }
 365
 366         if (!name)
 367                 return;
 368
 369         /*
 370          * if an older config under the same name exists, unload it
 371          * ignore errors here, e.g. if the config was not found
 372          */
 373         e = uci_lookup_list(&ctx->root, name);
 374         if (e)
 375                 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
 376         pctx->package = uci_alloc_package(ctx, name);
 377 }
 378
 379 /*
 380  * parse the 'package' uci command (next config package)
 381  */
 382 static void uci_parse_package(struct uci_context *ctx, bool single)
 383 {
 384         struct uci_parse_context *pctx = ctx->pctx;
 385         int ofs_name;
 386         char *name;
 387
 388         /* command string null-terminated by strtok */
 389         pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
 390
 391         ofs_name = next_arg(ctx, true, true, true);
 392         name = pctx_str(pctx, ofs_name);
 393         assert_eol(ctx);
 394         if (single)
 395                 return;
 396
 397         ctx->pctx->name = name;
 398         uci_switch_config(ctx);
 399 }
 400
 401 /*
 402  * parse the 'config' uci command (open a section)
 403  */
 404 static void uci_parse_config(struct uci_context *ctx)
 405 {
 406         struct uci_parse_context *pctx = ctx->pctx;
 407         struct uci_element *e;
 408         struct uci_ptr ptr;
 409         int ofs_name, ofs_type;
 410         char *name;
 411         char *type;
 412
 413         uci_fixup_section(ctx, ctx->pctx->section);
 414         if (!ctx->pctx->package) {
 415                 if (!ctx->pctx->name)
 416                         uci_parse_error(ctx, "attempting to import a file without a package name");
 417
 418                 uci_switch_config(ctx);
 419         }
 420
 421         /* command string null-terminated by strtok */
 422         pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
 423
 424         ofs_type = next_arg(ctx, true, false, false);
 425         type = pctx_str(pctx, ofs_type);
 426         if (!uci_validate_type(type))
 427                 uci_parse_error(ctx, "invalid character in type field");
 428
 429         ofs_name = next_arg(ctx, false, true, false);
 430         type = pctx_str(pctx, ofs_type);
 431         name = pctx_str(pctx, ofs_name);
 432         assert_eol(ctx);
 433
 434         if (!name || !name[0]) {
 435                 ctx->internal = !pctx->merge;
 436                 UCI_NESTED(uci_add_section, ctx, pctx->package, type, &pctx->section);
 437         } else {
 438                 uci_fill_ptr(ctx, &ptr, &pctx->package->e);
 439                 e = uci_lookup_list(&pctx->package->sections, name);
 440                 if (e)
 441                         ptr.s = uci_to_section(e);
 442                 ptr.section = name;
 443                 ptr.value = type;
 444
 445                 ctx->internal = !pctx->merge;
 446                 UCI_NESTED(uci_set, ctx, &ptr);
 447                 pctx->section = uci_to_section(ptr.last);
 448         }
 449 }
 450
 451 /*
 452  * parse the 'option' uci command (open a value)
 453  */
 454 static void uci_parse_option(struct uci_context *ctx, bool list)
 455 {
 456         struct uci_parse_context *pctx = ctx->pctx;
 457         struct uci_element *e;
 458         struct uci_ptr ptr;
 459         int ofs_name, ofs_value;
 460         char *name = NULL;
 461         char *value = NULL;
 462
 463         if (!pctx->section)
 464                 uci_parse_error(ctx, "option/list command found before the first section");
 465
 466         /* command string null-terminated by strtok */
 467         pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
 468
 469         ofs_name = next_arg(ctx, true, true, false);
 470         ofs_value = next_arg(ctx, false, false, false);
 471         name = pctx_str(pctx, ofs_name);
 472         value = pctx_str(pctx, ofs_value);
 473         assert_eol(ctx);
 474
 475         uci_fill_ptr(ctx, &ptr, &pctx->section->e);
 476         e = uci_lookup_list(&pctx->section->options, name);
 477         if (e)
 478                 ptr.o = uci_to_option(e);
 479         ptr.option = name;
 480         ptr.value = value;
 481
 482         ctx->internal = !pctx->merge;
 483         if (list)
 484                 UCI_NESTED(uci_add_list, ctx, &ptr);
 485         else
 486                 UCI_NESTED(uci_set, ctx, &ptr);
 487 }
 488
 489 /*
 490  * parse a complete input line, split up combined commands by ';'
 491  */
 492 static void uci_parse_line(struct uci_context *ctx, bool single)
 493 {
 494         struct uci_parse_context *pctx = ctx->pctx;
 495         char *word;
 496
 497         /* Skip whitespace characters at the start of line */
 498         skip_whitespace(ctx);
 499         do {
 500                 word = strtok(pctx_cur_str(pctx), " \t");
 501                 if (!word)
 502                         return;
 503
 504                 switch(word[0]) {
 505                         case 0:
 506                         case '#':
 507                                 return;
 508                         case 'p':
 509                                 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
 510                                         uci_parse_package(ctx, single);
 511                                 else
 512                                         goto invalid;
 513                                 break;
 514                         case 'c':
 515                                 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
 516                                         uci_parse_config(ctx);
 517                                 else
 518                                         goto invalid;
 519                                 break;
 520                         case 'o':
 521                                 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
 522                                         uci_parse_option(ctx, false);
 523                                 else
 524                                         goto invalid;
 525                                 break;
 526                         case 'l':
 527                                 if ((word[1] == 0) || !strcmp(word + 1, "ist"))
 528                                         uci_parse_option(ctx, true);
 529                                 else
 530                                         goto invalid;
 531                                 break;
 532                         default:
 533                                 goto invalid;
 534                 }
 535                 continue;
 536 invalid:
 537                 uci_parse_error(ctx, "invalid command");
 538         } while (1);
 539 }
 540
 541 /* max number of characters that escaping adds to the string */
 542 #define UCI_QUOTE_ESCAPE        "'\\''"
 543
 544 /*
 545  * escape an uci string for export
 546  */
 547 static const char *uci_escape(struct uci_context *ctx, const char *str)
 548 {
 549         const char *end;
 550         int ofs = 0;
 551
 552         if (!ctx->buf) {
 553                 ctx->bufsz = LINEBUF;
 554                 ctx->buf = malloc(LINEBUF);
 555
 556                 if (!ctx->buf)
 557                         return str;
 558         }
 559
 560         while (1) {
 561                 int len;
 562
 563                 end = strchr(str, '\'');
 564                 if (!end)
 565                         end = str + strlen(str);
 566                 len = end - str;
 567
 568                 /* make sure that we have enough room in the buffer */
 569                 while (ofs + len + sizeof(UCI_QUOTE_ESCAPE) + 1 > ctx->bufsz) {
 570                         ctx->bufsz *= 2;
 571                         ctx->buf = uci_realloc(ctx, ctx->buf, ctx->bufsz);
 572                 }
 573
 574                 /* copy the string until the character before the quote */
 575                 memcpy(&ctx->buf[ofs], str, len);
 576                 ofs += len;
 577
 578                 /* end of string? return the buffer */
 579                 if (*end == 0)
 580                         break;
 581
 582                 memcpy(&ctx->buf[ofs], UCI_QUOTE_ESCAPE, sizeof(UCI_QUOTE_ESCAPE));
 583                 ofs += strlen(&ctx->buf[ofs]);
 584                 str = end + 1;
 585         }
 586
 587         ctx->buf[ofs] = 0;
 588         return ctx->buf;
 589 }
 590
 591 /*
 592  * export a single config package to a file stream
 593  */
 594 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
 595 {
 596         struct uci_context *ctx = p->ctx;
 597         struct uci_element *s, *o, *i;
 598
 599         if (header)
 600                 fprintf(stream, "package %s\n", uci_escape(ctx, p->e.name));
 601         uci_foreach_element(&p->sections, s) {
 602                 struct uci_section *sec = uci_to_section(s);
 603                 fprintf(stream, "\nconfig %s", uci_escape(ctx, sec->type));
 604                 if (!sec->anonymous || (ctx->flags & UCI_FLAG_EXPORT_NAME))
 605                         fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
 606                 fprintf(stream, "\n");
 607                 uci_foreach_element(&sec->options, o) {
 608                         struct uci_option *opt = uci_to_option(o);
 609                         switch(opt->type) {
 610                         case UCI_TYPE_STRING:
 611                                 fprintf(stream, "\toption %s", uci_escape(ctx, opt->e.name));
 612                                 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->v.string));
 613                                 break;
 614                         case UCI_TYPE_LIST:
 615                                 uci_foreach_element(&opt->v.list, i) {
 616                                         fprintf(stream, "\tlist %s", uci_escape(ctx, opt->e.name));
 617                                         fprintf(stream, " '%s'\n", uci_escape(ctx, i->name));
 618                                 }
 619                                 break;
 620                         default:
 621                                 fprintf(stream, "\t# unknown type for option '%s'\n", uci_escape(ctx, opt->e.name));
 622                                 break;
 623                         }
 624                 }
 625         }
 626         fprintf(stream, "\n");
 627 }
 628
 629 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
 630 {
 631         struct uci_element *e;
 632
 633         UCI_HANDLE_ERR(ctx);
 634         UCI_ASSERT(ctx, stream != NULL);
 635
 636         if (package)
 637                 uci_export_package(package, stream, header);
 638         else {
 639                 uci_foreach_element(&ctx->root, e) {
 640                         uci_export_package(uci_to_package(e), stream, header);
 641                 }
 642         }
 643
 644         return 0;
 645 }
 646
 647 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
 648 {
 649         struct uci_parse_context *pctx;
 650         UCI_HANDLE_ERR(ctx);
 651
 652         /* make sure no memory from previous parse attempts is leaked */
 653         uci_cleanup(ctx);
 654
 655         uci_alloc_parse_context(ctx);
 656         pctx = ctx->pctx;
 657         pctx->file = stream;
 658         if (package && *package && single) {
 659                 pctx->package = *package;
 660                 pctx->merge = true;
 661         }
 662
 663         /*
 664          * If 'name' was supplied, assume that the supplied stream does not contain
 665          * the appropriate 'package <name>' string to specify the config name
 666          * NB: the config file can still override the package name
 667          */
 668         if (name) {
 669                 UCI_ASSERT(ctx, uci_validate_package(name));
 670                 pctx->name = name;
 671         }
 672
 673         while (!feof(pctx->file)) {
 674                 pctx->pos = 0;
 675                 uci_getln(ctx, 0);
 676                 UCI_TRAP_SAVE(ctx, error);
 677                 if (pctx->buf[0])
 678                         uci_parse_line(ctx, single);
 679                 UCI_TRAP_RESTORE(ctx);
 680                 continue;
 681 error:
 682                 if (ctx->flags & UCI_FLAG_PERROR)
 683                         uci_perror(ctx, NULL);
 684                 if ((ctx->err != UCI_ERR_PARSE) ||
 685                         (ctx->flags & UCI_FLAG_STRICT))
 686                         UCI_THROW(ctx, ctx->err);
 687         }
 688
 689         uci_fixup_section(ctx, ctx->pctx->section);
 690         if (!pctx->package && name)
 691                 uci_switch_config(ctx);
 692         if (package)
 693                 *package = pctx->package;
 694         if (pctx->merge)
 695                 pctx->package = NULL;
 696
 697         pctx->name = NULL;
 698         uci_switch_config(ctx);
 699
 700         /* no error happened, we can get rid of the parser context now */
 701         uci_cleanup(ctx);
 702
 703         return 0;
 704 }
 705
 706
 707 static char *uci_config_path(struct uci_context *ctx, const char *name)
 708 {
 709         char *filename;
 710
 711         UCI_ASSERT(ctx, uci_validate_package(name));
 712         filename = uci_malloc(ctx, strlen(name) + strlen(ctx->confdir) + 2);
 713         sprintf(filename, "%s/%s", ctx->confdir, name);
 714
 715         return filename;
 716 }
 717
 718 static void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
 719 {
 720         struct uci_package *p = *package;
 721         FILE *f1, *f2 = NULL;
 722         char *name = NULL;
 723         char *path = NULL;
 724         char *filename = NULL;
 725         struct stat statbuf;
 726         bool do_rename = false;
 727
 728         if (!p->path) {
 729                 if (overwrite)
 730                         p->path = uci_config_path(ctx, p->e.name);
 731                 else
 732                         UCI_THROW(ctx, UCI_ERR_INVAL);
 733         }
 734
 735         if ((asprintf(&filename, "%s/.%s.uci-XXXXXX", ctx->confdir, p->e.name) < 0) || !filename)
 736                 UCI_THROW(ctx, UCI_ERR_MEM);
 737
 738         if (!mktemp(filename))
 739                 *filename = 0;
 740
 741         if (!*filename) {
 742                 free(filename);
 743                 UCI_THROW(ctx, UCI_ERR_IO);
 744         }
 745
 746         if ((stat(filename, &statbuf) == 0) && ((statbuf.st_mode & S_IFMT) != S_IFREG))
 747                 UCI_THROW(ctx, UCI_ERR_IO);
 748
 749         /* open the config file for writing now, so that it is locked */
 750         f1 = uci_open_stream(ctx, p->path, NULL, SEEK_SET, true, true);
 751
 752         /* flush unsaved changes and reload from delta file */
 753         UCI_TRAP_SAVE(ctx, done);
 754         if (p->has_delta) {
 755                 if (!overwrite) {
 756                         name = uci_strdup(ctx, p->e.name);
 757                         path = uci_strdup(ctx, p->path);
 758                         /* dump our own changes to the delta file */
 759                         if (!uci_list_empty(&p->delta))
 760                                 UCI_INTERNAL(uci_save, ctx, p);
 761
 762                         /*
 763                          * other processes might have modified the config
 764                          * as well. dump and reload
 765                          */
 766                         uci_free_package(&p);
 767                         uci_cleanup(ctx);
 768                         UCI_INTERNAL(uci_import, ctx, f1, name, &p, true);
 769
 770                         p->path = path;
 771                         p->has_delta = true;
 772                         *package = p;
 773
 774                         /* freed together with the uci_package */
 775                         path = NULL;
 776                 }
 777
 778                 /* flush delta */
 779                 if (!uci_load_delta(ctx, p, true))
 780                         goto done;
 781         }
 782
 783         f2 = uci_open_stream(ctx, filename, p->path, SEEK_SET, true, true);
 784         uci_export(ctx, f2, p, false);
 785
 786         fflush(f2);
 787         fsync(fileno(f2));
 788         uci_close_stream(f2);
 789
 790         do_rename = true;
 791
 792         UCI_TRAP_RESTORE(ctx);
 793
 794 done:
 795         free(name);
 796         free(path);
 797         uci_close_stream(f1);
 798         if (do_rename && rename(filename, p->path)) {
 799                 unlink(filename);
 800                 UCI_THROW(ctx, UCI_ERR_IO);
 801         }
 802         free(filename);
 803         if (ctx->err)
 804                 UCI_THROW(ctx, ctx->err);
 805 }
 806
 807
 808 /*
 809  * This function returns the filename by returning the string
 810  * after the last '/' character. By checking for a non-'\0'
 811  * character afterwards, directories are ignored (glob marks
 812  * those with a trailing '/'
 813  */
 814 static inline char *get_filename(char *path)
 815 {
 816         char *p;
 817
 818         p = strrchr(path, '/');
 819         p++;
 820         if (!*p)
 821                 return NULL;
 822         return p;
 823 }
 824
 825 static char **uci_list_config_files(struct uci_context *ctx)
 826 {
 827         char **configs;
 828         glob_t globbuf;
 829         int size, i;
 830         char *buf;
 831         char *dir;
 832
 833         dir = uci_malloc(ctx, strlen(ctx->confdir) + 1 + sizeof("/*"));
 834         sprintf(dir, "%s/*", ctx->confdir);
 835         if (glob(dir, GLOB_MARK, NULL, &globbuf) != 0) {
 836                 free(dir);
 837                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 838         }
 839
 840         size = sizeof(char *) * (globbuf.gl_pathc + 1);
 841         for(i = 0; i < globbuf.gl_pathc; i++) {
 842                 char *p;
 843
 844                 p = get_filename(globbuf.gl_pathv[i]);
 845                 if (!p)
 846                         continue;
 847
 848                 size += strlen(p) + 1;
 849         }
 850
 851         configs = uci_malloc(ctx, size);
 852         buf = (char *) &configs[globbuf.gl_pathc + 1];
 853         for(i = 0; i < globbuf.gl_pathc; i++) {
 854                 char *p;
 855
 856                 p = get_filename(globbuf.gl_pathv[i]);
 857                 if (!p)
 858                         continue;
 859
 860                 if (!uci_validate_package(p))
 861                         continue;
 862
 863                 configs[i] = buf;
 864                 strcpy(buf, p);
 865                 buf += strlen(buf) + 1;
 866         }
 867         free(dir);
 868         globfree(&globbuf);
 869         return configs;
 870 }
 871
 872 static struct uci_package *uci_file_load(struct uci_context *ctx, const char *name)
 873 {
 874         struct uci_package *package = NULL;
 875         char *filename;
 876         bool confdir;
 877         FILE *file = NULL;
 878
 879         switch (name[0]) {
 880         case '.':
 881                 /* relative path outside of /etc/config */
 882                 if (name[1] != '/')
 883                         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 884                 /* fall through */
 885         case '/':
 886                 /* absolute path outside of /etc/config */
 887                 filename = uci_strdup(ctx, name);
 888                 name = strrchr(name, '/') + 1;
 889                 confdir = false;
 890                 break;
 891         default:
 892                 /* config in /etc/config */
 893                 filename = uci_config_path(ctx, name);
 894                 confdir = true;
 895                 break;
 896         }
 897
 898         UCI_TRAP_SAVE(ctx, done);
 899         file = uci_open_stream(ctx, filename, NULL, SEEK_SET, false, false);
 900         ctx->err = 0;
 901         UCI_INTERNAL(uci_import, ctx, file, name, &package, true);
 902         UCI_TRAP_RESTORE(ctx);
 903
 904         if (package) {
 905                 package->path = filename;
 906                 package->has_delta = confdir;
 907                 uci_load_delta(ctx, package, false);
 908         }
 909
 910 done:
 911         uci_close_stream(file);
 912         if (ctx->err) {
 913                 free(filename);
 914                 UCI_THROW(ctx, ctx->err);
 915         }
 916         return package;
 917 }
 918
 919 __private UCI_BACKEND(uci_file_backend, "file",
 920         .load = uci_file_load,
 921         .commit = uci_file_commit,
 922         .list_configs = uci_list_config_files,
 923 );